Claude Fable 5.1 vs Muse Spark 1.3 Max: Benchmark Comparison
Claude Fable 5.1 has the higher score on 14 of 18 shared benchmarks; Muse Spark 1.3 Max leads on 3.
The largest observed score gap is 42.00 pts on ProofBench v1.1 , where Claude Fable 5.1 leads.
Reported ±1 standard-error ranges overlap on 6 of 16 shared benchmarks with comparable uncertainty data. This is not a pairwise statistical significance test.
Shared benchmark results
Scores and reported standard errors come from the latest visible Vals benchmark version available for both models.
| Benchmark | Claude Fable 5.1 | Muse Spark 1.3 Max | Gap | Reported uncertainty |
|---|---|---|---|---|
| Vals Index | 65.83% ±1.11 | 58.16% ±1.19 | 7.66 pts | Reported ±1 SE ranges do not overlap |
| Vals RSI Index | 36.09% | 19.64% | 16.45 pts | Uncertainty comparison unavailable |
| Harvey's Legal Agent Benchmark | 6.67% ±1.17 | 23.75% ±3.55 | 17.08 pts | Reported ±1 SE ranges do not overlap |
| Legal Research Bench | 55.29% ±3.46 | 55.29% ±3.46 | 0.00 pts | Reported ±1 SE ranges overlap |
| EMB | 76.67% ±2.08 | 67.43% ±3.06 | 9.24 pts | Reported ±1 SE ranges do not overlap |
| Finance Agent (v2) | 58.88% ±2.06 | 59.96% ±2.06 | 1.08 pts | Reported ±1 SE ranges overlap |
| Tax Agent Bench | 77.64% ±2.83 | 72.44% ±2.88 | 5.20 pts | Reported ±1 SE ranges overlap |
| ProofBench v1.1 | 100.00% ±0.00 | 58.00% ±4.96 | 42.00 pts | Reported ±1 SE ranges do not overlap |
| MysteryMechanism | 47.75% ±3.36 | 36.04% ±3.23 | 11.71 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench Science | 40.00% ±5.90 | 10.00% ±3.61 | 30.00 pts | Reported ±1 SE ranges do not overlap |
| Code Migration | 54.61% ±4.81 | 47.41% ±4.26 | 7.19 pts | Reported ±1 SE ranges overlap |
| IOI | 90.78% ±4.65 | 56.56% ±2.52 | 34.22 pts | Reported ±1 SE ranges do not overlap |
| ProgramBench | 7.00% ±1.81 | 2.50% ±1.11 | 4.50 pts | Reported ±1 SE ranges do not overlap |
| Terminal-Bench 4.0 | 58.08% ±3.31 | 24.75% ±0.51 | 33.33 pts | Reported ±1 SE ranges do not overlap |
| Vibe Code Bench 1-100 | 28.00% ±4.49 | 20.46% ±3.85 | 7.54 pts | Reported ±1 SE ranges overlap |
| Vibe Code Bench v1.1 | 90.26% ±1.57 | 85.86% ±2.51 | 4.41 pts | Reported ±1 SE ranges do not overlap |
| CyberBench v1.1 | 70.42% ±5.43 | 72.74% ±5.67 | 2.32 pts | Reported ±1 SE ranges overlap |
| CUA-bench | 13.17% | 5.83% | 7.33 pts | Uncertainty comparison unavailable |
Performance by category
| Category | Claude Fable 5.1 average | Muse Spark 1.3 Max average |
|---|---|---|
| Legal | 30.98% | 39.52% |
| Finance | 71.06% | 66.61% |
| Math | 100.00% | 58.00% |
| Science | 43.87% | 23.02% |
| Coding | 54.79% | 39.59% |
| Cyber | 70.42% | 72.74% |
Cost and latency
Cost per test appears only where the benchmark reports it for both models. Latency is the measured completion time for that benchmark.
| Benchmark | Claude Fable 5.1 cost | Muse Spark 1.3 Max cost | Claude Fable 5.1 latency | Muse Spark 1.3 Max latency |
|---|---|---|---|---|
| Vals Index | $28.71 | $3.79 | 1h17m | 23m33s |
| Vals RSI Index | $298.22 | $48.82 | 90h00m | 90h00m |
| Harvey's Legal Agent Benchmark | $46.21 | $2.26 | 1h52m | 14m35s |
| Legal Research Bench | $23.06 | $0.59 | 57m29s | 5m17s |
| EMB | $15.93 | $2.55 | 29m32s | 13m50s |
| Finance Agent (v2) | $8.35 | $0.76 | 18m14s | 3m19s |
| Tax Agent Bench | $13.18 | $0.39 | 28m34s | 4m09s |
| ProofBench v1.1 | $2.70 | $0.48 | 7m58s | 9m29s |
| MysteryMechanism | $5.63 | $0.85 | 17m41s | 7m32s |
| Terminal-Bench Science | $38.01 | $6.09 | 2h36m | 1h24m |
| Code Migration | $70.97 | $14.21 | 4h20m | 1h24m |
| IOI | $11.20 | $1.73 | 30m06s | 28m58s |
| ProgramBench | $58.52 | $54.29 | 2h27m | 5h28m |
| Terminal-Bench 4.0 | $17.18 | $6.65 | 1h00m | 52m56s |
| Vibe Code Bench 1-100 | $149.66 | $5.60 | 2h53m | 20m02s |
| Vibe Code Bench v1.1 | $33.37 | $2.54 | 57m40s | 16m18s |
| CyberBench v1.1 | $4.01 | $3.34 | 18m32s | 16m18s |
| CUA-bench | $323.78 | $143.48 | 37.44s | 36.39s |
Results available only for Claude Fable 5.1
- LegalBench
- MortgageTax
- TaxEval v2
- MedCode
- MedScribe
- GPQA Diamond
- MMLU Pro
- MMMU Pro
- SAGE
- LiveCodeBench
- SkillsBench
- SRE Bench
- Public Benefits Bench v1.1
- Time Horizon Index: KSP
Results available only for Muse Spark 1.3 Max
None.